The Dynatron: A Vacuum Tube Possessing Negative Electric Resistance

@article{HullTheDA,
  title={The Dynatron: A Vacuum Tube Possessing Negative Electric Resistance},
  author={Albert W. Hull},
  journal={Proceedings of the Institute of Radio Engineers},
  volume={6},
  pages={5-35}
}
  • A. W. Hull
  • Published 1 February 1918
  • Physics
  • Proceedings of the Institute of Radio Engineers
A new, hot cathode, three electrode vacuum tube, the dynatron, is described. A constant, positive voltage is applied between the hot cathode and the perforated rugged anode. A supplementary anode is placed beyond the main anode, and is maintained at a lower positive potential than the main anode. Because of secondary electronic emission from the supplementary anode, thru a certain range of applied voltages, the supplementary anode-to-filament circuit acts as a true negative resistance… 

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